The area of the circle is 615.44. What is the diameter of the circle? Use 3.14 for pi

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup